This bulletin has been amended to include vehicles with 30 MPH Self-Check logic. Discard previous bulletin.
APPLIED VEHICLES: All Nissan Vehicles with ABS or ABS/VDC
SERVICE INFORMATION
If you identify:
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Clicking, knocking, clunking, buzzing, or thumping noise coming from the engine compartment area.
And:
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The noise occurs only once per ignition cycle (ignition OFF> ON) and does not occur again until the ignition is cycled.
And:
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The noise happens briefly for only a few seconds on acceleration, between 5 and 30 MPH; depending on vehicle model and year.
The above condition is normal, may be louder if the vehicle has not been operated for a prolonged period of time, and does not need repair.
Each time the ignition is turned on and the vehicle reaches approximately 5 to 30 MPH, the ABS/VDC system performs a "Self-Check" to confirm components of the ABS/VDC system are operating correctly.
This Self-Check function creates the noise described above.
If the brakes are being applied when the Self-Check occurs, a vibration may be felt in the brake pedal and an increased level of noise may be noticed.
NOTE:
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See chart above for vehicles with 30 MPH Self-Check logic. Those not on charts will Self-Check at between approximately 5-20 MPH.
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Some drive patterns may not reach Self-Test speed on first acceleration.
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Refer customers to the Owners Manual, Section 5, Starting and driving, Brake system on the Anti-Lock Braking System (ABS). The "Self-Test" feature section provides additional explanation.
